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Important Linux features 225

DONE

INDEX

When executing scripta a possible output is:

Wed Jan 3 03:51:07 PST 1996

/home/guest

scripta

fila

Note: the first line of the script should be:

#! /bin/sh

2. scriptb displays the contents of a pulse program:

• edit the file scriptb and enter:

dir=/opt/topspin/exp/stan/nmr/lists/pp

cd $dir

cat $1

$dir = the value of a parameter which is set in the script

$1 = an argument given to the script when it is executed

• make the file executable: chmod +x scriptb

• execute the script by typing its name and argument: ./scriptb zg30

3. Example of a control and loop structure in a shell script:

for i in ‘ls *.c‘ (for all files with the extension .c)

if grep strn $i

(if the file contains the string strn)

then

rm $i

(remove the file)

done

1. "./" means: the command resides in the current directory. You can skip the "./" if the current

directory is part of the Linux search path. Type echo $PATH to see the Linux search path.

1. For more information on control and loop structures type man sh or man test.

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Red Hat ENTERPRISE LINUX WS 2.1 - Guida di Installazione Pagina 225